source: http://getsatisfaction.com/youmail/topics/what_happens_after_i_rate_a_transcription_and_update_the_text

"Remember, YouMail transcriptions are human-edited. 

So there's a process by which "rankings/corrections" gets fed back to the people who were involved in doing the original transcription - which allows the transcribers to be ranked/evaluated on quality, with the lower quality transcribers eliminated. It also allows us to understand what sort of mistakes folks are making in the editing and make sure"